Determination of Low Level Nitrogen and Sulfur in Light Aromatic Hydrocarbons

In 2000, the EPA implemented the Tier 2 Gasoline Sulfur program. This program reduced the allowable sulfur content in gasoline to 15ppm and NOx content to 0.07g/mile. The Tier 2 program was initiated out of the Clean Air Act requirement of the Environmental Protection Agency. In 2017, a Tier 3 program was applied requiring even lower sulfur and nitrogen content in gasoline and diesel. The new emission standards combined with the lowered sulfur content will reduce much of the toxic emissions including nitrogen oxides from motor vehicles. Due to these new regulations there is a need for better analysis of low level Nitrogen and Sulfur.